Abstract
We are presenting the flux dynamics studies on swift heavy ion irradiated high- TcRBa2Cu307-y (R-123 where R = Y and Dy) thin films. R-123 thin films with highly c-axis orientation were grown using pulsed laser deposition and. DC magnetron sputtering techniques. The well characterized films were irradiated with 250 MeV Ag ion beam at different fluence values equivalent to B in the range 1T to 20T. The nature of columnar amorphization and structural symmetry changes produced by swift heavy ions in these films were investigated by scanning tunneling microscopy (STM), which provided the information regarding the columnar track diameter in these materials. The flux dynamic studies were performed using magnetization and electronic transport measurements. We have observed a remarkable enhancement in critical current density and pinning force in these materials upto an optimum value of ion fluence and after that the decline in them. The magnetization results were analyzed using critical state models and the magneto-transport results were analyzed in the frame work of Bose-glass model.
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